Throughflow cylinder

Abstract

A throughflow cylinder made at least partly of fiber-reinforced plastic including glass fibers, aramide fibers, carbon fibers, and/or carbon-reinforced plastic (CRP). The matrix material of the fiber-reinforced plastic includes a material heat resistant at least up to 300° C. such as a resin. At least one fiber layer is provided such that the coefficient of thermal expansion α of the fiber-reinforced plastic is lower than that of steel at approximately 300° C. and preferably lies in a region of 0≦α<9·10 −6 ·1/Kelvin. The manufacture of the fiber-reinforced plastic, for example carbon fiber-reinforced plastic, is such that more than approximately 30%, in particular more than approximately 50% and preferably more than approximately 70% of the fibers are oriented at least substantially in the peripheral direction.

1. A throughflow cylinder for drying a fiber web in a throughflow drying unit, said throughflow cylinder being comprised of fiber-reinforced plastic, further including a plurality of webs extending in a circumferential direction and a plurality of webs extending in an axial direction, said plurality of webs extending in a circumferential direction including said fiber-reinforced plastic having a plurality of fibers that are substantially oriented in said circumferential direction, said plurality of webs extending in an axial direction including metal, said plurality of webs extending in an axial direction including cutouts for said plurality of webs extending in a circumferential direction. 
   
   
     2. The throughflow cylinder of  claim 1 , wherein said plurality of webs extending in a circumferential direction are ring-shaped. 
   
   
     3. The throughflow cylinder of  claim 1 , wherein said plurality of webs extending in a circumferential direction are adhesively bonded to said plurality of webs extending in an axial direction. 
   
   
     4. The throughflow cylinder of  claim 1 , further including a floating bearing connected to said throughflow cylinder. 
   
   
     5. The throughflow cylinder of  claim 1 , further including a jacket having a plurality of four-cornered passage openings. 
   
   
     6. The throughflow cylinder of  claim 5 , wherein said plurality of four-cornered passage openings are a plurality of square passage openings. 
   
   
     7. The throughflow cylinder of  claim 5 , wherein said plurality of four-cornered passage openings are a plurality of rectangular passage openings. 
   
   
     8. The throughflow cylinder of  claim 5 , wherein said plurality of four-cornered passage openings are formed between said plurality of webs extending in a circumferential direction and said plurality of webs extending in an axial direction. 
   
   
     9. The throughflow cylinder of  claim 5 , wherein an open area of said plurality of four-cornered passage openings is between approximately 95% and 98%. 
   
   
     10. The throughflow cylinder of  claim 5 , wherein at least one of said plurality of four-cornered passage openings measures approximately 60 mm by 120 mm. 
   
   
     11. The throughflow cylinder of  claim 1 , wherein said plurality of webs extending in an axial direction are at least one of equal and higher than said plurality of webs extending in a circumferential direction. 
   
   
     12. The throughflow cylinder of  claim 1 , wherein both said plurality of webs extending in a circumferential direction and said plurality of webs extending in an axial direction end in a circumferential plane. 
   
   
     13. The throughflow cylinder of  claim 1 , wherein said plurality of webs extending in an axial direction project radially outwardly respective to said plurality of webs extending in a circumferential direction. 
   
   
     14. The throughflow cylinder of  claim 1 , wherein said plurality of webs extending in an axial direction include a height, said height is greater than approximately 100 mm. 
   
   
     15. The throughflow cylinder of  claim 14 , wherein said height is greater than approximately 200 mm.